Computing machine



Sept. 9, 1941.

W. W. LANDSIEDEL COMPUTING MACHINE Filed Feb. 15, 1937 16 Sheets-Sheet l INVENT OR WALTER .W LANDSIEDEL HIS ATTORNEY Sept. 9, 1941. w. w. LANDSIEDEL COMPUTING MACHINE Filed Feb. 15, 1957 16 Sheets-Sheet 2 INVENTOR WALTER .W. LANDSIEDEL.

HIS ATTORNEY Sept. 9,194 w. w. LANDSIEDEL COMPUTING MACHINE Filed Feb. 15, 1937 16 Sheets-Sheet 3 INVENTOR WALTER W. LANDSIEDEL HRS ATTORNEY Sept. 9, 1941. w. w. LANDSIEDEL COMPUTING MACHINE Filed Feb. 15, 1937 16 Sheets-Sheet 4 Q INVENTOR. QWALTERWLANDSIEDEL HIS ATTORNEY.

Sept. 9, 1941. w. w. LANDSIEDEL COMPUTING MACHINE l6 Sheets-Sheet 5 Filed Feb. 15, 1937 Q OE - INVENTOR. WALTER w. LANDSIEDEL HIS ATTORNEY.

Sept 9, 1941. w. w. LANDSIEDEL COMPUTING MACHINE Filed Fb. 15, 19s? 16 Sheets-Sheet 6 2.5 7 Q I r x I J LANDSIEDEL ms ATTORNEY.

WALTER .TLWT

P 1941- w. w. LANDSIEDEL 2,255,622 COMPUTING MACHINE Filed Feb. 15/1937 16 Sheets-Sheet 7 N 0 O E 4 LT. R.

INVENTOR WALT W. LANDSIEDEL HIS ATTORNEY Sept- 1941- w. w. LANDSIEDEL 2,255,622

COMPUTING MACHINE Filed Feb. 15, 1937 16 Sheets-Sheet 8 44 FIG .10

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COMPUTING MACHINE Filed Feb. 15, 1937 16 Sheets-Sheet 9 INVENTOR. WALTER W LANDSIEDEL HIS ATTORNEY p 1941- w. w. LANDSIEDEL 2,255,622

COMPUTING MACHINE 7 Filed Feb. 15, 1937 16 Sheets-Sheet l0 INVENTOR. WALTERW. LANDSIEDEL ms ATTORNEY.

p 1941- w. w. LANDSIEDEL 2,255,622

COMPUTING MACHINE Filed Feb. 15, 1937 16 Sheets-Sheet 11 INVENTOR. WALTER W LANDSIEDEL HIS ATTORNEY.

Sept. 9, 1941- w. w. LANDSIEDEL COMPUTING MACHINE Filed Feb. 15, 1957 16 Sheets-Sheet l2 QUE w W A E V W WALTER.W.LANDSIEDEL HIS ATTORNEY.

Sept. 9, 1941; w. w. LANDSIEDEL COMPUTING MACHINE Filed Feb. 15, 1937 16 Sheets-Sheet l3 INVENTOR. WALTERMLLANDSIEDEL 02 HIS ATTORNEY.

Sept. 9, 1941. w. w. LANDSIEDEL COMPUTING MACHINE Filed Feb. 16 Sheets-Sheet l4 mm NwN ANNOE HIS ATTORNEY.

P 1941- w. w. LANDSIEDEL 2,255,622

COMPUTING MACHINE Filed Feb. 15, 1957 16 sheets-sheet 15 INVENTOR WALTER.W. LANDSlEDEL HIS ATTORNEY p 1- w. w. LANDSIEDEL 2,255,622

COMPUTING MACHINE Filed Feb. 15, 1957 16 Sheets-Sheet 16 FIG. 2'71 INVENTOR WALTER W. LANDSIEDEL BY 4% HIS ATTORNEY Patented Sept. 9, 1941 COMPUTING MACHINE Walter W. Landsiedel, Elmira, N. Y., assignor to Remington Rand Inc., Buffalo, N. Y., a corporation of Delaware Application February 15, 1937, Serial No. 125,704

12 Claims.

This invention relates to calculating machines and particularly to that type of machine wherein multiplication and division may be accomplished and a product or quotient and remainder may be printed.

The particular machine, in which the present invention is embodied, is of the same general type as that shown in the Patent 1,899,444 to T. 0. Mehan, issued February 28, 1933, and is in the form of a general improvement upon the machine which is shown and described in Patent 2,203,336, dated June 4, 1940, and my copending application, Serial No, 73,020, filed April 6, 1936, wherein a series of control pins, contained in a movable pin carriage, is set up from the keyboard to control the rearward movement of a series of actuating racks which, at certain times,

mesh with either the adding or the subtracting pinions of an algebraic totalizer unit to accumulate positive or negative amounts and wherein each amount entered in the machine may be listed upon a tape or record sheet. Totals are taken, in the usual manner after .a blank stroke, as is disclosed in the Mehan patent mentioned above. The machine shown in Patent No. 2,203,336 is somewhat different from Mehans machine in that it contains an algebraic totalizer and subtraction key. Because of this it contains a fugitive one mechanism and is made so that it will print true negative totals.

The present invention improves upon the direct subtraction machine by adding novel mechanism for performing multiplication and division whereby all the factors are printed upon a tape or record sheet, which is carried upon the platen of the machine. The present invention includes a dial for counting machine operations, a type rack which, in multiplication, prints the multiplier one digit at a time, and means for automatically printing a star if the multiply key is held depressed for more than nine consecutive machine cycles. It also includes means for performing fully automatic division in which the machine automatically effects back spacing and prints the digits of the quotient, one under another, on the left of the tape and in which the machine automatically stops after completing a problem. If there is a remainder, it will be printed by taking a total and this will, at the same time, clear the machine.

One object of this invention is to provide novel mechanism for accomplishing multiplication on an adding machine.

Another object is to provide a visible dial for 55 counting machine cycles in multiplication and division.

A third object is to provide means for automatically back spacing the movable pin carriage during multiply or divide operations.

A fourth object is to provide means for automatically printing a. star or asterisk when themultiply key is held depressed for more than nine machine cycles. N 1

Another object of this invention is to provide means for automatically printing a star when,

in division, the divisoras" been improperly set up on the keyboard".

A further object is to provide novel mechanism foraccomplishing fully automatic division. r

Still another object of the present invention is to provide means for automatically stopping the machine, during a division operation, when the lowest order digit of the divisor reaches units column. I

Another object is to provide a manual stop leverfor stopping the machine during the process of division and before full division has been accomplished.

Another object is to provide means for printing the multiplier, in a multiplication problem, at a place apart from the printed multiplicand and product.

Another object of the invention is to provide means for printing the quotient, in division, at a place apart from the printed dividend, divisor and remainder, printing each successive digit directly under the preceding one.

Other objects and structural details of the invention will be apparent from the following description when read in connection with the accompanying drawings in which:

Fig. 1 is a sectional elevation taken just inside the right hand machine frame and showing the subtract key, the algebraic totalizer, the adding racks, the movable pin carriage, and the printing mechanism.

Fig. 2 is an elevational detail view 01 the accumulator operating mechanism.

Fig. 3 is a right hand elevation of the subtract key and associated mechanism for shifting the accumulator cradle from its add to its subtract position and vice versa and with the parts in the position they assume when th accumulator pinions are in mesh with their actuating racks.

Fig. 4 is a right hand elevation of substantially the same parts shown in Fig. 3 but showing the parts in the position they assume when the accumulator pinions are out of engagement with their respective actuating racks.

Fig, 5 is a fragmentary left hand elevation of the machine showing the parts with the machine casing removed.

Fig. 6 is a fragmentary right hand elevation of the machine with the casing removed and with parts of the base plate broken away.

Fig. 7 is a fragmentary right hand elevation of the machine showing part of the motor drive.

Fig. 8 is a fragmentary top plan view showing the motor drive.

Fig. 9 is a skeleton top plan view showing the back spacing mechanism and its associated parts.

Fig. lo is a front elevation of the machine showing only the back space mechanism and such other incidental parts as are necessary to locate it.

Fig. 11 is a front elevation of the paper knife and tape showing the decimal point locating means.

Fig. 12 is a front elevation of the paper knife and tape showing the decimal point locating means in its operated position but with the tape in its lowermost position.

Fig. 13 is a left hand sectional elevation taken just inside the left hand outer frame plate showing the non-add mechanism and the detent release mechanism for the multiplier and quotient rack.

Figs. 14 and'l5 are right hand sectional elevations of the multiplier and quotient rack showing the accumulator wheels of highest order, the special slide cooperating with them for automatically stopping the machine, and the mechanism for raising and holding the multiplier and quotient rack.

Fig. 16 is a fragmentary detail view of the forward end of the special slide shown in Figs. 14 and 15.

Fig. 17 is a left hand elevation of the multiply key and the associated parts which are moved immediately by depression of this key, certain parts remaining in normal position.

Fig. 18 is a left hand elevation similar to Fig. 17 but with the multiply key omitted and showing the division lever and manual machine stop lever and showing such parts as cooperate with the division lever on the left hand side of the machine.

Fig. 19 is a fragmentary isometric taken at the right front corner of'the machine and showing part of the subtraction mechanism.

Fig. 20 is 'a fragmentary isometric showing the manual machine stop lever, the adding rack of units or lowest order and the bail which operates in automatically stopping the machine.

Fig. 21 is an isometric view of the back space latch and the mechanism for cutting out the automatic carriag return positively during back space operations.

Fig, 22 is a top plan view of the keyboard showing the correction and single back space keys.

Fig. 23 isa rear elevation of the multiplier and quotient type rack.

Fig. 23A is a right-hand elevation of the multiplier and quotient type rack.

Fig. 24 is a left hand elevation showing the division lever and associated parts as they will appear at the end of the forward stroke of the first cycle in a division operation.

Fig. 25 is a left hand fragmentary elevation showing the stub key (and associated parts) in the position it assumes when it is latched down.

' lever in its tripped position and its associated parts.

Fig. 27 is a detail sectional elevational view of the key and main shaft interlock.

' Fig. 28 is an elevational detail view of the line space mechanism.

The machine in which the present invention is embodied is of the ten-key, key-set, lever-operated type which has a reversible totalizer and which contains a movable stop carriage and a set of accumulator actuatin racks controlled thereby to enter amounts into the totalizer. The totalizer itself is settable for eitheraddition or subtraction. The present invention adds the features of multiplication by repeated addition and fully automatic division by repeated subtraction and prints the digits of the multiplier in multiplication and the digits of the quotient in division. The machine also has a dial for visibly counting machine cycles when multiplying or dividing and contains many other novel features and mechanisms which will be described in detail hereinafter.

As will be seen from an examination of Fig. 1, the machine contains the usual pin carriage i, movable from right to left and thence back to normal, which carries rows of pins 2 arranged in rows of 9 from front to rear which pins 2 are adapted to be depressed by the digit keys 3 of the machine. These pins 2 act as stops for the adding racks 4 as is old and well known.

The totalizer in this machine consists of two sets of pinions, designated as 5 and 6, respectively, which are in constant mesh with each .other and which are held by a cradle 1. When the pinions are held out of mesh with their respective actuating racks 4, a set of spring pressed detents 8 retains the pinions in position. The mechanism for moving the pinions into and out of engagement with their respective racks 4 is shown in Fig. 2. Here, a wipe pawl 9, on the forward stroke of the main operating shaft 95 (in addition or subtraction), engages a pin II on a pin plate l2 to raise the accumulator cradle I (through the raising of accumulator catch l3) and thus raise the accumulator pinions out of mesh with their racks 4. On the return stroke, the wipe pawl 9 engages a pin 14 to reengage the accumulators, all of which is old in Mehan No. 1,899,444. In totaling the accumulator catch I3 is moved by linkage, not shown herein but shown in Fig. 5 of the copending application, Serial No. 68,694, clockwise about its pivot I3A, (by which it is attaohed to an accumulator raising bail arm l5), to its rearmost position. In doing this, the accumulator catch l3 cams the pin .16 into the slot l1 and thus turns the pin plate clockwise so that the wipe pawl 9 does not aifect the pin H or raise the accumulators out of mesh on the forward stroke of a total taking operation. The accumulator bail arm l5- and, hence, the accumulator pinions are held positively in either their upper or lower position by a spring pressed detent l8 acting in conjunction with an accumulator lock l9 as is shown in Fig. 5 of the copending' application, Serial No, 68,694.

Referring to Figs. 1, 3 and 4, it will be seen that subtraction is accomplished by depression of the subtract key 20 which raises the right hand arm 2| (as viewed from the front of the machine) of a bail shaped piece 22. The arm 2| holds, near its rear end, a leftwardly projecting pin 23 which constantly engages a slot 24 in a plate 25. The plate 25 is mounted for vertical sliding movement; upon the left hand side, as viewed from the front of the machine, of a plate 26 by pin and slot connections so that the plate 25 may move up or down without affecting the plate 26. A cam 21 is mounted fast on the main operating shaft 95 and holds, upon its right hand side, two pins 28 and 29 respectively, which are adapted to engage one or another of two leftwardly bent cars 36 on the plate 25. The parts are so arranged that, if the plate 25 has been raised by depression of the subtract key as shown in Figs. 3 and 4, a counter-clockwise movement of the main operating shaft 65 will bring the pin 29 on the cam 21 into contact with the lower car 36 of the plate 25 and will move this plate, together with the plate 26 to which it is attached, rearward where they will remain until the subtract key 26 is released. When the key 26 is released, the plate 25 will immediately fall to its lower position and, if the main operating shaft 95 is then swung counterclockwise as seen in Figs. 3 and 4, the pin 29 will clear the lower ear 36 and the pin 26 will contact the upper ear 36 on plate 25 and will push both the plate 25 and its associated plate 26 forward. A T shaped rock arm 3| is mounted upon a suitable base plate bracket 32 and is fixed, for rotating movement, to the plate 26 by a pin and slot connection 33 so that when the plate 26 is moved rearward by depression of the subtract key and operation of the main shaft 95,

the rock arm 3| will be swung clockwise and when the plate 26 is moved forward the rock arm 3| will be swung counter-clockwise and this will be accomplished during the first part of the forward stroke of the main operating shaft 95. Fixed to the right hand end of the accumulator cradle (as seen from the front of the machine) is a single pinion 34 (Figs. 3 and 4) which, when the accumulators are out of mesh with their respective actuating racks, meshes with a rack segment 35, fast to the left hand top part of the T'shaped rock arm 3|. It will, therefore, be seen that when the subtract key is depressed and the machine is operated, the T shaped rock arm 31 will be swung toward the rear of the machinev and that this will revolve the accumulator cradle 180, through its pinion 34, so that the set of subtraction accumulator wheels will be brought into vertical alignment with their actuating racks 4 (Fig. 1) and also that, when the subtract key is released and the machine is operated, the accumulator cradle will be revolved 180 in the opposite direction to bring the set of adding pinions into vertical alignment and operative relation with the actuating racks 4. A spring pressed detent 36, acting upon a roller 31, tends to hold the rock arm 3| in either its forward or rearward position and also to move the arm 3| to either position with a decided snap. From the foregoing it is seen how the machine is conditioned for either addition or subtraction. As will be seen from Fig. 4, the plate 26 has, at its forward end, an oblong portion 38 which maintains, between two leftwardly bent off ears 39, a roller 46 which is integral with the right hand face (as seen from the front of the machine) of an arm 4| which is the right hand arm of a ball 42 as shown in Fig. 1.

All the preceding description has been givenmerely to give an accurate idea of the basic mechanisms in the machine and if further data is desired, it may be obtained from the drawings and specification of the aforementioned application. It was not intended that the description, given thus far, should be minute in detail but it was thought that a general description of the basic functions and mechanisms of the machine upon which the present invention is founded would be enough to clarify the methods of addition, subtraction and totaling.

M otor drive The motor drive of the present machine is Referring to Figs. 6, '1 and 8-of the drawings,

a small motor 53 is geared as shown to a clutch ratchet disk 54 so that, as the motor armature revolves, it positively drives the clutch ratchet but at a suitable reduced speed. The motor 53 may be made to run continuously but in the present instance it is turned on and off by means to be presently described. Loosely mounted upon a shaft 55, upon which the clutch disk 54 is made fast, is a crank disk 56 which carries upon its right hand side, (as viewed from the front of the machine), an engaging pawl 51 bearing a tooth 56 which is adapted to engage between the teeth of the clutch ratchet 54 and thus operate the crank disk 56 when the pawl 51 is released. A spring 56, anchored at one end to the crank disk 56 and at its other end to the top of pawl 51 tends constantly to draw the pawl 'into engagement with the clutch ratchet 54. A three armed bafl shaped bell crank 66, having an upper arm 6| and a lower arm 62 on its right hand side and an arm 63 on its left hand side, is pivoted upon a fixed rod 64 which is secured to the base X of the machine by brackets not shown. The upper arm 61 of hell crank 66 has, pivoted to its top, the rear end of a link 65 which is connected at its forward end to the upright arm 66 of a three armed motor control bell crank 61. The forwardly extending arm 66 carries a stud 69 which is adapted to be engaged by either a stem 16 of the regular motor bar of the machine or by an arm 1| (Figs. 6 and 19) fast to a motor control shaft 12 which runs laterally across the front of the machine and is operated at its left hand end by the multiplication and division mechanism which will later be described in full. The rearwardly extending arm 13 of the motor control bell crank 61 carries a stud 14 upon its right hand side which operatively connects the motor control bell crank 61 with a link 15 by means of a slot 16 in the lower portion thereof. This link 15,

. as is more clearly shown in Fig. 19, is pivoted at its upper end to a rearwardly projecting finger 11 which is formed integral with the subtraction key lever 26A.

It will thus be apparent that the motor control bell crank 51 will be swung counter-clockwise about its pivot (Fig. 6) by depression of the subtraction key and consequent raising of link 16, by depression of the motor bar and consequent depression of its stem 16, and by the clockwise rotation of lever 1| (Figs. 6 and 19) and its shaft 12 through the multiplication and division mechanism and it will also be evident that the counter-clockwise rotation thus imparted to the motor control bell crank 61 will, through its upper arm 66 and link 65, pull the bail shaped bell crank 66 (Fig. 7) counter-clockwise about its pivot shaft. This will lower the arm 62 of the bell crank 66 out of the path of a heel 51A -95 and then a return or clockwise stroke.

on the clutch engaging pawl 51 and will allow the pawl to snap into the teeth of the clutch ratchet 54. crank 66, which has two steps out into its forward face, will be lowered enough so that a spring pressed latch 18, which is pivoted at 19 to an upright wall formed integral with the base and which is normally retained'by the lower step of arm 63,.will snap toward the front of the machine (or clockwise as viewed in Fig. 7) until it is retained by the upper step on the arm 63. In so doing, the latch 18 will move forward a link 86 which is pivoted to latch 18 by a pin 8| and this link 86 will move a bell crank BIA, having a leftwardly bent over ear 82, counter-clockwise. Bell-crank 8IA is fast to the right hand end of a shaft 83 which extends laterally across the front endof the machine. Also, the latch 18, when it snaps to its forward position will move down a contactor 84, which is secured to its top and which carries two contact points 85, so that the contacts 85 will engage contacts 86, held on an insulating strip 81 secured to the base, and a circuit will be completed to start the motor. From the above, itwill be clear that, when the motor control bell crank 61 is rocked counter-clockwise, it pulls the link 65 forward and thus rocks the bail shapedbell crank 66 counter-clockwise and that this, in turn, engages the clutch and simultaneously starts'the motor to turn the crank disk 56. The crank disk 56, as isshown-in Fig. 7, carries a roller 88 on its right hand side which rides in a slot 89, cut in the rear end of a bell crank operating lever 96 which is pivoted to the base X at 9|. ward arm of the bell crank operating lever 96 carries a roller 92 which engages a radial slot 93,

The for- At the same time the arm 63 of bell cut in an operating lever 94 which is yieldably Q connected through a strong spring (not shown) to the main operating shaft 95 of the machine.

} It'will thus be evident that, when the crank disk 56- revolves once, it imparts, by means of its roller 88 and bell crank 96 and operating lever 94, first a forward or counter-clockwise movement (see Fig. 7) to the main operating shaft On the periphery of the crank disk 56, is a tooth 96 which engages the pin 8|, by which the latch 18 and the link 86 are connected, near the end of every cycle of rotation of the crank disk 56. The tooth strikes the pin 8| from below (Fig. '7) and thus earns the latch 18 rearward so that a spring 91 (anchored at its top to the latch 18 and at its bottom to the arm 62 of bell crank 66) snaps the bail shaped bell crank clockwise and brings the lower step on arm 63 thereof, up into position to retain the latch 18 in its rearward or normal position. However, if something holds the link 65 in its forward position, through the bellcrank 61, the tooth -86, on the crank disk 56, will cam the latch 18 rearward or counterclockwise but the link 65 will prevent the bell crank 66 from moving and the latch will immediately return to its forward position on the top step .of arm 63. It is thus evident that even though the motor circuit is broken once for each revolution of the crank disk 56 it will be reestablished immediately and the machine will continue to operate until the motor control bell crank 61 is returned to normal position.

Machine frames right outer frame plate IIII, left inner frame plate I62 and right inner frame plate I63. The frame plates I66, I6I, I62, and I66 are all securely screwed to the moulded base x and it is upon these four frames and base that all the mechanism in the machine is mounted.

Multiplication Referring particularly to Figs. 5 and 17, a hulltiply key I64 is mounted by slots I66 upon headed studs I66 which are fast to the left hand outer frame plate I66 and which guide the key for vertical sliding movement. A spring I61 tends to constantly draw the multiply key I64 to its upper or normal position. Between the key I64 and the frame plate I66, lies a stub key I68 (shown in isometric in Fig. 26), which is also guided for vertical movement by the studs I66 and which has a round pin I68 protruding from its left hand side and a square pin II6 (see Fig. 26) protruding from its right hand side, the pins I69 and H6 being axially aligned on opposite sides of the stub key I68. The leftwardly pro truding pin I69 rides in a slot III cut in the multiply key I64 so that, whenever the multiply key is depressed, it depresses the stub key I68 and the stub key will be latched down for one extra machine cycle after the multiply key has been released.

The mechanism for latching down the stud key I68 and for releasing it will now be described. Mounted for forward and rearward sliding movement, (Fig. 13), upon two studs H2 is a link 3 which carries, 'at its rear end, a roller II4 which rides in a cam slot II5, cut in a cam II6 fast upon the main operating shaft 95. It will thus be seen that the link will be positively moved' forward and rearward once for every operating cycle of the machine. At the forward end of link 3 is a pin III which, when the link is moved forward, pushes against the right hand arm II8 of a spring pressed bail II9, which is pivoted upon a stub shaft I ISA which is mounted upon the right hand face of the left outer machine frame plate I66, and swings the bail counter-clockwise as seen in Fig. 13. The left hand arm I26 of the ball 9 is made in the form of a latch so that it engages the square pin II6 on the right hand side of the stub key I 68. Since the operator does not remove his finger from the multiply key until the end of a return multiply stroke, as will presently be described, the bail arm cle. Hence the stub key operates the machine for one extra cycle after the multiply key is released.

Referring again to Figs. 5 and 17 and particularly to Fig. 17, it will be seen that a three armed bell crank I2I is pivoted at I22 to the left hand outer frame plate I66 and that the upper arm I23, thereof, is connected by a pin and slot to a link I24. This link I24 extends rearwardly and is pivoted at I25 .to the downwardly extending left hand arm I26 of a bail shaped bell crank whose right hand arm I21 extends forwardly of its pivot shaft I28 and carries a toe I29 which is adapted to be positioned in the path of the regular hammer restoring bail I36 whenever the link I24 is pulled toward the front of the machine or toward the right in Figs. 17 and 5. The forwardly extending arm I 3| of the bell crank I2I carries a lamination I32 near its front end which lies in the same vertical plane as the multiply key I64 and which is adapted to be engaged by the bottom of the key I64 but which 

